Answer of FAQ

How do I reduce the size of the exported AVI, FLV or MPEG videos?

There are multiple strategies for reducing the file size of exported
videos.
The strategies depend on whether a lossless output format such as FLV
or a lossy format such as AVI or MPEG is used.
In the first section, strategies for the lossless FLV format are described.
In the second section, you will find strategies for lossy formats such as AVI or MPEG.

The following strategies work well for reducing the file-size of
the FLV (flash)-output:

reduce the frame-rate from the default 25 to, say, 10, by using
the commandline option "--fps 10"
Please experiment which frame-rate is still within your quality
requirements.
It depends a lot on what you are actually recording. For many
applications, a frame-rate of 10 still looks pretty good.

scale the video to a lower size and resolution.
Scaling is done with a high quality anti-aliasing algorithm, so the
result may still look very good.
How much of scaling still looks good really depends on what you are
recording.
Scaling can be done with the commandline option "--resolution 512x384"
(replace the numbers with numbers of your choice)

While recording, avoid unnecessary movements of the mouse-pointer.
Movements of the mouse-pointer contribute a lot to the size of the
video.

If your recording does not contain audio, please disable audio in
the exporter by using the option "--no-sound"

For AVI or MPEG output, we suggest the following strategies

reduce the frame-rate from the default 25 to, say, 10, by using
the commandline option "--fps 10" and at the same time reduce the
output-bitrate by the same amount.
Please experiment which frame-rate is still within your quality
requirements.
It depends a lot on what you are actually recording. For many
applications, a frame-rate of 10 still looks pretty good.

scale the video to a lower size and resolution.
Scaling is done with a high quality anti-aliasing algorithm, so the
result may still look very good.
How much of scaling still looks good really depends on what you are
recording.
Scaling can be done with the commandline option "--resolution 512x384"
(replace the numbers with numbers of your choice)

While recording, avoid unnecessary movements of the mouse-pointer.
Movements of the mouse-pointer contribute a lot to the size of the
video.

If your recording does not contain audio, please disable audio in
the exporter by using the option "--no-sound"

Please experiment with the output bitrate. Lowering the output-bitrate
will decrease file-size but will also decrease quality.
Which quality you prefer really depends on your requirements.
The output-bitrate may be set with the option "--output-bitrate" and is specified in
kbits/sec, so for example "--output-bitrate 1000" specifies 1000kbits/sec.
The defaults are as follows: